first day of the second month (lunar calendar)
Traditional term used in the context of the old lunar calendar; rarely encountered in modern Japanese outside historical or cultural references.
In the old lunar calendar, 初朔日 refers to the first day of the second month.
Compound of 初 (hatsu, 'first') and 朔日 (tsuitachi, 'first day of the month'). The reading はつついたち reflects the combination of these elements.